title: Induction of proliferation and Ig production in human B leukemic cells by anti-immunoglobulins and T cell factors.
abstract: The proliferation and differentiation of human leukemic B cells (B-CLL cells) with anti-Ig and T cell-derived helper factors are described. Stimulation of B-CLL cells with anti-Ig and T helper factors could induce proliferation as well as differentiation into IgM- and IgG-producing cells. Neither anti-Ig nor T helper factors alone could induce any proliferation and/or differentiation of B-CLL cells. Not only whole molecules of anti-Ig but also F(ab')2 fragments could induce proliferation and differentiation of B-CLL cells in the presence of T helper factors, but monovalent Fab' fragments were not effective. Induction of both IgM and IgG with the same idiotype was confirmed by immunofluorescent and SDS-PAGE analysis. By employing an IL 2-dependent cytotoxic T cell line and a TRF-responsive B cell line, T cell factors were separated into a fraction with IL2 activity but no TRF activity and a fraction with TRF activity but no IL 2 activity by chromatofocusing. Anti-Ig and IL 2 fraction could induce proliferation of B-CLL cells, but TRF fraction was not effective for the induction of proliferation in anti-IG-stimulated cells. For IgM and IgG production, anti-Ig and both IL 2 and TRF fractions were required. Depletion of IL 2 fraction in the first 2 days' culture inhibited Ig production, whereas the absence of TRF fraction in the first 2 days did not show any inhibitory effect on Ig production.
mesh_terms: D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D002471:Cell Transformation, Neoplastic; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis; D007130:Immunoglobulin Idiotypes / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007136:Immunoglobulins / Q000096:biosynthesis*; D007375:Interleukin-1; D007376:Interleukin-2 / Q000302:isolation & purification / Q000494:pharmacology; D015848:Interleukin-5; D007525:Isoelectric Focusing; D007945:Leukemia, Lymphoid / Q000276:immunology*; D008222:Lymphokines / Q000302:isolation & purification / Q000494:pharmacology; D011506:Proteins / Q000494:pharmacology; D011817:Rabbits
chemical_list: D000888:Antibodies, Anti-Idiotypic; D007074:Immunoglobulin G; D007130:Immunoglobulin Idiotypes; D007075:Immunoglobulin M; D007136:Immunoglobulins; D007375:Interleukin-1; D007376:Interleukin-2; D015848:Interleukin-5; D008222:Lymphokines; D011506:Proteins